Resolving dependencies...
Configuring validity-0.5.0.0...
Building validity-0.5.0.0...
Installed validity-0.5.0.0
Configuring validity-time-0.2.0.0...
Building validity-time-0.2.0.0...
Installed validity-time-0.2.0.0
Configuring pretty-relative-time-0.0.0.0...
Building pretty-relative-time-0.0.0.0...
Failed to install pretty-relative-time-0.0.0.0
Build log ( /home/builder/.cabal/logs/ghc-8.2.2/pretty-relative-time-0.0.0.0-KIq9eVnT1cCA5joeo9WTik.log ):
cabal: Entering directory '/tmp/cabal-tmp-5742/pretty-relative-time-0.0.0.0'
Configuring pretty-relative-time-0.0.0.0...
Preprocessing library for pretty-relative-time-0.0.0.0..
Building library for pretty-relative-time-0.0.0.0..
[1 of 5] Compiling Paths_pretty_relative_time ( dist/build/autogen/Paths_pretty_relative_time.hs, dist/build/Paths_pretty_relative_time.o )
[2 of 5] Compiling Text.Time.Pretty.Constants ( src/Text/Time/Pretty/Constants.hs, dist/build/Text/Time/Pretty/Constants.o )
[3 of 5] Compiling Text.Time.Pretty.TimeAgo ( src/Text/Time/Pretty/TimeAgo.hs, dist/build/Text/Time/Pretty/TimeAgo.o )

src/Text/Time/Pretty/TimeAgo.hs:26:5: error:
    ‘isValid’ is not a (visible) method of class ‘Validity’
   |
26 |     isValid = isValidByValidating
   |     ^^^^^^^
cabal: Leaving directory '/tmp/cabal-tmp-5742/pretty-relative-time-0.0.0.0'
cabal: Error: some packages failed to install:
pretty-relative-time-0.0.0.0-KIq9eVnT1cCA5joeo9WTik failed during the building
phase. The exception was:
ExitFailure 1